You probably think you already know what yokai means. And, you are probably wrong. Or at least, you are only partially correct. There is more to yokai than you think.

Thanks to movies like “The Great Yokai War,” and comics and books like “Nura: Rise of the Yokai Clan” and “Yokai Attack!,” yokai as a word is slowly making its way into the English language. People are becoming aware of Japan’s legacy of magic and mystery. But, “yokai” is entering English with a meaning almost-but-not-quite the same as the Japanese meaning.

It is kind of like the word “manga”—in English, manga has come to mean “Japanese comics.” Exclusively. But in Japanese, manga just means … comics. All comics. Regardless of national origin. Iron Man? Manga. Mickey Mouse? Manga. Rex Morgan, M.D.? Manga. Tin Tin? Manga. And it doesn’t even specifically mean books (That would be “manga no hon.”) “Manga” can mean toys, movies, games … anything comic-related. It has a vast meaning beyond the limited scope of usage that we have given the word in English. I digress.

Of course, yokai can refer to Japan’s menagerie of monsters. All of the beasties and spirits—the baku, the kodama, the yuki onna, the kappa—all of these are yokai. I am as guilty as the next person for using yokai as a generic term for “Japanese monster.” It works. It fits. But that’s not the whole story.

Many other things are also yokai, things that are not creatures of any sort. Like the word manga, the Japanese usage of yokai has a much larger scope. It covers much more than just monsters.

(It is worth noting that “Nura: Rise of the Yokai Clan” isn’t called that in Japanese. The original title is “Nurarihyon no Mago” meaning “Nurarihyon’s Grandson.” The term “Yokai Clan” was tagged on to appeal to English readers.)

Breaking Down the Kanji – 妖怪

Like most Japanese words, the key to the meaning is in the kanji. So let’s start there.

Yokai uses two kanji;

妖 (yo) which means “mysterious, bewitching, unearthly, weird.” It doesn’t really have a scary nuance to it, but more of the attraction to something beyond the normal. It can be used in words like yoka (妖花) meaning an ethereally beautiful flower, or ayashii (妖しい) meaning bewitching or charming.

怪(kai) which means “mystery, wonder, strange.” Kai has more of a sense of horror, or the bizarre. It is the same kanji used in kaidan (怪談) meaning “weird tales” and kaiki (怪奇) meaning “bizarre, strange, outrageous.”

Put those two together and you get yokai妖怪, with a direct translation along the lines of “something that is otherworldly and strange yet captivating and appealing.” But direct translation of kanji almost never gives the full picture.

So, What Does Yokai Really Mean?

I think a better translation would be “mysterious phenomena”—or even “Fortean phenomena” if that means anything to you. “Mysterious phenomena” is probably better.

Along with folkloric creatures, yokai can refer to things like strange weather, mysterious illnesses, optical illusions, weird fruit, etc … And yokai is not limited to Japan. In his Yokai Encyclopedias, comic artist/folklorist/genius Mizuki Shigeru covers things like the Moai statues on Easter Island, or bigfoot and the yeti, or vampires and ghouls, or rains of frogs. Yokai is a broad, sweeping term that can cover pretty much everything weird on Earth.

Here’s what Japanese Wikipedia has to say:

“Yokai as a term encompasses oni, obake, strange phenomenon, monsters, evil spirits of rivers and mountains, demons, goblins, apparitions, shape-changers, magic, ghosts, and mysterious occurrences. Yokai can either be legendary figures from Japanese folklore, or purely fictional creations with little or no history. There are many yokai that come from outside Japan, including strange creatures and phenomena from outer space. Anything that can not readily be understood or explained, anything mysterious and unconfirmed, can be a yokai.”

That great arbitrator of all things yokai, Mizuki Shigeru, further breaks down the word yokai into four separate categories:

So if you think in the classic biological classification model, then you would have something like this:

Bakeneko is a yokai > henge

Oiwa is a yokai > yurei

Bigfoot is a yokai > kaiju

Bermuda Triangle > yokai > choshizen

(Very) Brief History of the Word Yokai

Yokai is a pretty old world, pre-dating most of Japanese folkloric vocabulary. The oldest known use of “yokai” is from the 1st century text “Junshiden” (循史伝) where the author writes “The yokai was in the Imperial Court for a long time.” The term is used to describe a sense of unnatural anxiety and foreboding. It shows up again in 772, in “Shoku Nihongi” (続日本紀) where a ritual cleansing of the palace is recommended to “clear away the yokai.” It isn’t used in the sense of any particular bad creature, but just accumulated “bad juju” that might be clinging to the palace.

Yokai as a term for Japan’s folkloric beasts didn’t really appear until the Edo period, with the publication of “Yokai Chakutocho” (夭怪着到牒 ), a yokai bestiary of the kind still familiar today. Sharp-eyed readers ( or those who know Japanese) will see that a different set of kanji was used; 夭 (yo, calamity, disaster ) + 怪 (kai). That kanji has a much more distinct menacing feel to it.

Texts from the Edo period also distinguish between types of yokai, such as “strange natural phenomenon” or “strange living things.” Also during the Edo period, when Japan began to have contact with other cultures, books began to be published of accounts of “Yokai of the West.”

Now you Know What Yokai Means!

Of course, this is the quick and dirty version. Whole books can and have been written on yokai, on the history of yokai, on the evolution and social meaning, etc … At least now when you want to start diving into things like that, you will have a clearer understanding of what the word yokai actually means!

I wrote this article mainly to clear up some misapprehensions. More and more I see people refer to yokai as if it meant some sort of tribe of Japanese monsters. And while that isn’t exactly incorrect, it is a simplification. So here is a little deeper dive for yokai fans.

When a child in Japan wakes shaking from a nightmare, she knows what to do. Hugging her face in her pillow, she whispers three times “Baku-san, come eat my dream. Baku-san, come eat my dream. Baku-san, come eat my dream.” If her request is granted, the monstrous baku will come into her room and suck the bad dream away. But the baku cannot be summoned without caution. A too-hungry baku might not be satiated with a single dream, and might suck away her hopes and ambitions along with it, leaving her hollow.

What is a Baku?

Baku are classic chimera; the body of a bear, the nose of an elephant, the feet of a tiger, the tail of an ox, and the eyes of a rhinoceros. One legend says that when the gods were finished creating the animals, they took all of the odds and ends lying around and put them together to make the baku.

According to Japanese legend, baku are the eaters of bad dreams. They are a talismanic figure, that people pray to at night to come and suck away nightmares so that they may never be seen again. But there is a darker side to the baku; some say that baku eat all dreams, not only nightmares. This includes dreams of aspiration, dreams of your future, and dreams of hope.

Is the Baku Real?

While they are wildly stylized, baku resemble the Asian tapir. And in fact, in Japanese they share the same name and kanji (獏). The baku is not alone in this; the word kirin is not only Japanese for giraffe but also a mythical Chinese monster.

Which came first—the legend or the animal—is hidden in the past, with no solid agreement on either side. Many say that the two are unconnected, and that the similar appearance is pure coincidence, with the animal being named after the legend. Some say a wayward sailor drifted to Malaysia, and came back with stories of a massive creature that was transformed by legend.

Either way, the legend is old in his book “Ancient Chinese Gods and Beasts,” Kyoto University professor Hayashi Minao points to ancient bronze ware and other artifacts inscribed with images of the mythical baku. He postulated that some creature like the Asian tapir might have existed in China at sometime, but has since gone extinct.

Baku are often confused with another Chinese legendary animal, the hakutaku (called a bai ze in Chinese). In fact, at Gobyakukan-ji temple in Tokyo, there is a statue called the Baku King, which was originally a statue of a hakutaku.

Is the Baku a Yokai?

A complicated question, that depends on how broad your definition of a yokai is. It isn’t a yokai in the sense of fantasy creatures like the nure onago or bakeneko. It is more of a sacred animal, more associated with gods than monsters. Mizuki Shigeru uses the broadest possible definition of yokai, meaning anything mysterious from Bigfoot to rains of frogs, by which the baku definitely qualifies.

The History and Legends of the Baku

Like many folkloric creatures, baku have changed over the centuries. In the oldest Chinese legends, baku were hunted for their pelts. It was said that using a blanket made from a baku was a talisman against illness and the malice of evil spirits. Due to a lack of available baku pelts, this eventually changed to where putting an image of a baku over the bed would afford you equal protection. During the Tang dynasty( 618 – 907), folding screens decorated with baku were a popular item.

Somehow, the legend of the baku was transmitted to Japan, where the beast became associated with the dream eating that it is best known for today. The Tang period book Torokuten (Six Stories of the Tang dynasty) also tells of a sacred animal called a bakuki that eats dreams, and it is likely that the two were merged into a single legend.

The baku legend as a dream-eater has stayed consistent since adopted by Japan. There have been various ways of summoning the baku. In Fukushima it is said that if, after awaking from a bad dream, you say “I give this dream to the baku,” then that dream will never trouble you again. In other prefectures, you repeat “Baku-san, come eat my dream” three times in a row to summon to baku to come and eat your nightmares.

During the Muromachi period (1337 to 1573) in Japan, it became popular for people on their death bed to hold an image of a baku as a talisman against evil spirits. They also became associated with the fantastical Treasure Galley, which often had a baku painted on its sails. During the Edo period (1603 to 1868), pillows were sold in the shape of baku, said to protect the sleeper from bad dreams.

Baku in Modern Japan

While many yokai and legendary creatures have faded until they live only in the memory of academics and comic artists, baku are still a popular figure in modern Japan. The baku appears in many modern animation and comic books, although in appearance they look more and more like authentic tapir, and less and less like the folkloric chimera.